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Figure 1. IC1, the MAX931 comparator, monitors the main supply voltage. It also turns on the backup battery ......
volatile的本意是“易变的” 由于访问寄存器的速度要快过RAM,所以编译器一般都会作减少存取外部RAM的优化。比如:static int i=0;int main(void){...whil......
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